TABLE 9.
Percentages (N), significance test, effect sizes, and logistic regression models on sample subgroups with low BIS comparing low (group 1) and high (group 2) presence of IS.
| Descriptive statistics | Bivariate significance tests | Logistic regression | |||||
| Group 1 | Group 2 | ||||||
| % (N) | SRC | % (N) | SRC | R2 = 15.7% | |||
| Sex | Boys (ref.) | 51.4%(206) | 8.1 | 28.8%(283) | −8.1 | X2(1) = 63.57, p < 0.001; phi = 0.214 | B-G: OR = 2.83 (2.09 – 3.84) |
| Girls | 48.6%(195) | −8.1 | 71.2%(700) | 8.1 | |||
| Age (years) | 13–14 year (ref.) | 22.2%(89) | 4.3 | 12.7%(125) | −4.3 | X2(2) = 26.44, p < 0.001; V = 0.138 | 13–15: OR = 1.71 (1.16 – 2.51) 13–17: OR = 2.58 (1.69 – 3.93) |
| 15–16 year | 50.9%(204) | 1.2 | 49.4%(486) | –1.2 | |||
| 17–18 year | 26.9%(108) | −4.4 | 37.8%(372) | 4.4 | |||
| FAS | Low (ref.) | 23.2%(82) | –0.1 | 24.5%(218) | 0.1 | X2(2) = 0.66, p = 0.719; V = 0.023 | L-M: OR = 1.11 (0.77 – 1.59) L-H: OR = 1.03 (0.69 – 1.53) |
| Medium | 47.5%(168) | –0.6 | 48.3%(430) | 0.6 | |||
| High | 29.4%(104) | 0.8 | 27.2%(242) | –0.8 | |||
| BMI | Thin | 14.3%(49) | 2.2 | 9.9%(87) | –2.2 | X2(2) = 5.02, p = 0.081; V = 0.064 | O-T: OR = 0.49 (0.28 – 0.89) O-N: OR = 0.85 (0.59 – 1.24) |
| Normal | 62.3%(213) | –0.6 | 64.4%(565) | 0.6 | |||
| Overweight/obese (ref.) | 23.4%(80) | –0.9 | 25.7%(226) | 0.9 | |||
| BIP | Thin | 13.4%(53) | –0.8 | 14.8%(145) | 0.8 | X2(2) = 21.25, p < 0.001; V = 0.124 | O-T: OR = 1.36 (0.82 – 2.27) O-N: OR = 0.60 (0.41 – 0.86) |
| Normal | 29.2%(116) | 5.1 | 18.0%(176) | −5.1 | |||
| Overweight (ref.) | 57.4%(228) | −3.8 | 67.1%(656) | 3.8 | |||
| Diet to lose | No (ref.) | 76.5%(306) | 0.3 | 76.4%(749) | –0.3 | X2(1) = 0.01, p = 0.977; phi = 0.001 | N-Y: OR = 0.88 (0.62 – 1.26) |
| Yes | 23.5%(94) | –0.3 | 23.6%(231) | 0.3 | |||
| Diet to gain | No (ref.) | 96.3%(385) | –0.3 | 96.5%(946) | 0.3 | X2(1) = 0.07, p = 0.798; phi = 0.007 | N-Y: OR = 1.06 (0.49 – 2.27) |
| Yes | 3.8%(15) | 0.3 | 3.5%(34) | –0.3 | |||
| MVPA | Null (ref.) | 6.5%(24) | −4.0 | 16.0%(146) | 4.0 | X2(2) = 57.71, p < 0.001; V = 0.221 | N-L: OR = 0.48 (0.26 – 0.86) N-H: OR = 0.28 (0.14 – 0.55) |
| Low | 66.4%(245) | –1.9 | 72.3%(661) | 1.9 | |||
| High | 27.1%(100) | 6.0 | 11.7%(107) | −6.0 | |||
| VPA | Null (ref.) | 13.2%(49) | –2.3 | 19.5%(177) | 2.3 | X2(2) = 12.98, p = 0.002; V = 0.101 | N-L: OR = 0.93 (0.59 – 1.44) N-H: OR = 0.93 (0.55 – 1.58) |
| Low | 57.8%(214) | –1.3 | 59.6%(542) | 1.3 | |||
| High | 28.9%(107) | 3.5 | 21.0%(191) | −3.5 | |||
The bold values indicate small (0.10–0.29), medium (0.30–0.49), or high (0.50 and above) effect size values – phi and V-, odd ratios which value 1 is outside the confidence interval and corrected standardized residuals –SRc– higher to 2.33 (one-sided confidence interval of 99%).